Author(s)

Zhangkai Luo, Zhongmin Pei, Xinmin Wang

Corresponding Author

Zhongmin Pei

ABSTRACT

In this paper, a transmission method base on time-varying array and polarization filtering is proposed to enhance the information security in wireless communications. Indeed, the information is firstly divided into two parts and respectively modulated into amplitude-phase symbols. Then, two sets of symbols respectively multiply with two polarization states (PS), which are orthogonal to each other. After that, the two signals are added up to be mixed signals for transmission by the dual-polarized phased array. To enhance the information security, transmit antennas of the dual-polarized phased array are randomly chosen, thus the amplitude and phase of all directions vary randomly except for the main lobe, which leads to the distortion of the constellation structure at the eavesdropper side. In this way, the PSs of two signals are difficult to crack and the transmission security is ensured. Finally, simulations demonstrate the proposed can effectively deteriorate the bit error performance of eavesdroppers by distorting the constellation in sidelobes.

KEYWORDS

wireless communication; information security; polarization filtering